Features: 2.4G+BT5.1 Dual Modes Wireless Transmission Technology，Energy-saving, built-in storage, no need for code, for smart connection. 250Hz high rate return chip, data transmission is faster，fast cursor positioning. Add a one-click desktop feature to quickly return to the desktop. Fashionable slim design: Slim design for sleek look and portable use. Silent design,quiet and elegant office wireless mouse. Buttons: 2 Buttons and 1 Round (middle button) and Dpi for key and One-button desktop button ( only support for windows system ). System Requirements: for Windows 98 / Me / 2000 / XP / Vista / Win 7 / Win8 / 10/ Vista or latest. Specifications: Model: M103 Dual Modes Color: Black ,for Grey ,Silver (optional) Material: ABS for Key Life: 5 Million Times（silent design） Wireless Distance: 15m/ Work: Photoelectricity Battery Capacity: 500mAh（chargeable lithium battery） Charging Cable Length: 25cm/ 9.84in Project Type: Ergonomics Optical Mouse Resolution: 800,1200,1600 (1200dpi Default) Operation Mode: Opto-electronic Rated Voltage / Current: 3.7V / 18mA Power Type: Rechargeable（charging for time 2h，working for time 150h） Type: 2.4Ghz Rechargeable Wireless Mouse Item Size: approx. 11.3x5.7x2.5cm/ 4.45x2.24x0.98in Package Includes: 1x 2.4 G+BT5.1 Dual Modes Mouse 1x USB Receiver 1x USB Charging Cable(25cm) 1x Instruction Manual note: Please allow 1-2cm errors due to manual measure. Pictures may not reflect actual color due to the different monitors.